WIP: Started with Schoenfeld residual work
Schoenfeld residual transition function
Zph main python function
Set residual to zero for censored data
WIP: Add final function to normalize residual vector
refactor of residual code
Undo some changes in commit: 2039012 introduced due to bad rebasing
WIP: Aggregate for correlation between array and scalar
Fix bugs and finish madlib.array_elem_corr_agg
Fix bugs and make zph work
Fix bugs in creating summary table
Optimize the SQL in residual computation
Redefine and rewrite zph
Merged the design doc for stratified Cox including the residual computation part
Validate function, create residual table
Fix for usage function